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Hello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.ello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.
Some trees and shrubs require acidic soil pH (below 7.0) or they will develop iron chlorosis. Examples include river birch, blueberries, azaleas and rhododendrons. While it is easier to work with plants adapted to your current soil pH, there are amendments you can use to make your soil more acidic.